Shareholders' Equity - Share-based Compensation, Stock Option Activity (Details) (Stock Options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Options [Member]
Awards, Stock Options, Number of Shares [Roll Forward]
Outstanding at January 1, Shares	50,070	71,038	28,363
Granted, Shares	0	0	96,662
Cancelled, Shares	(8,617)	(14,889)	(2,735)
Exercised, Shares	(7,721)	(6,079)	(51,252)
Outstanding at December 31, Shares	33,732	50,070	71,038
Exercisable, Shares	28,676	39,987	57,985
Awards, Stock Options, Weighted Average Exercise Price [Roll Forward]
Outstanding at January 1, Weighted Average	$ 6.98	$ 8.00	$ 10.13
Granted, Weighted Average	$ 0.00	$ 0.00	$ 6.79
Cancelled, Weighted Average	$ 8.58	$ 8.38	$ 7.33
Exercised, Weighted Average	$ 5.69	$ 8.21	$ 6.92
Outstanding at December 31, Weighted Average	$ 6.86	$ 6.98	$ 8.00
Exercisable, Weighted Average	$ 6.95	$ 7.14	$ 8.38

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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